Adjustable film gate



April 12, 1938. R H, DRAEGQ 2,113,580

ADJUSTABLE FILM GATE Filed April 6, 1937 2 Sheets-Sheet 1 l lllslllllllllllllllll [HI] I] o INVEN TOR.

W a M A TTORNEYS.

April 12, 1938. R. H. DRAEGER ADJUSTABLE FILM GATE 2 Sheets-Sheet 2 ggisg Filed April 6, 1937 7 m w w w my m m w A Pl/PEBT fl id Patented Apr. 12, 1938 UNITED STATES ADIU STABLE FILM GATE Rupert H. Draeger, United States Navy Application April 6, 1937, Serial No. 135,266

4Claims.

(Granted under the act of March amended April 30, 1928: 370 O. G. 75'!) This invention relates to adjustable film gates for use in copying cameras, projectors, enlargers or the like and more particularly to the type of film gate illustrated and described in my Patent No. 2,073,627 of March 16, 1937.

In cameras of this type or the like it is both desirable and economical that only that length of film be exposed which is equal to the length of the image of the object being copied. when larger or smaller objects are copied it is also desirable to be able to use more than one width of film in order to effect further economies.

The object of this invention is to provide an adjustable film gate having readily replaceable film gate pieces to serve for the use of more than one width of film.

Other objects ofthls invention will be apparent from these specifications and the accompanying drawings forming a part thereof and the scope is to be limited only by the claims appended hereto.

In the drawings:

Fig. 1 is a side elevation of a camera partially broken away to show the film gate.

Fig. 2 is a plan view of the film gate partially broken away to show the gate pieces.

Fig. 3 is an exploded view of the film gate mechanism showing the relation between the various parts.

Figs. 4a and 4b are plan views of two sizes of interchangeable film gate pieces, and

Fig. 5 is a sectional view on lines 5-5 of Fig. 2.

In the. accompanying drawings F 1 shows one form of camera constructed in accordance with the present invention. In the camera case 35 llisshownabase il havingareoessflinwhich the two gate carrier members I! and II are slideably supported These members are retained by two guides l5 and it which are attached to the base H by screws 11.

The pins l3 and 23 attached to gate carrier members I! and I3 extend into the slotted ends of toggle II, which is rotatably mounted on pin 2! attached to frame II.

The gate carrier member I: is provided with 45 rack 2| which engages spur gear 22 mounted on control shaft 23. The gate pieces 24 and 25, having apertures ll oiasiaeappropriatetothewidthfilmtobeused, difierent sized apertures being provided for difierent widths of film as shown at 3! and 33, are mutually interlocking as disclosed in my above mentioned Patent 2,073,827. These gate pieces are fitted with locating holes 26 which fit over pins 21 and are slidabiy held in place by guides 55 II and It.

. The gate pieces 23 and 2! are further fitted with grooves 23 to receive the balls ll protruding from lmies II in the guides. These balls 3. arethrustintogroovesllbyspringsflretained so ypi sfiflandarepreventediromeseapingirom holes 3| by lips 34. The film gate pieces 24 and 25 are recessed to receive the different width films and 36.

The film gate cover 31 and pressure plate 33 are rotatably attached to the arms of base II by pins 33.

In operation, when it is desired to change the length of the film exposed in the film gate, the lengthof the aperture 4| may be increased or decreased by the proper manipulation of the control rod 23. When it is desired to use another width of film the cover 38 may be raised and the film gate pieces 24 and 25 replaced by film gate pieces of a difierent aperture width to accommodate the diiIerent width of film.

The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

What I claim is:

l. A film gate having means for permitting the exposure of different lengths of more than one width of film, said film gate consisting of two removable film gate pieces providing the complete film gate aperture and means for guiding film through said film gate parallel to the center line of the length of the aperture in said gate.

2. A film gate comprising in combination a plurality of removable film gate pieces providing the complete film gate aperture, and means for actuating said film gate pieces, said means being removably associated with said film gate pieces to permit the interchanging .of said film gate pieces with other film gate pieces having different width apertures for accommodating more than one width of film.

3. A film gate comprising means for exposing difierent lengths of film, said means including removable film gate pieces, carrier means adapted for holding film gate pieces for accommodating difieient widths of film. said film gate pieces being in the same plane in cooperative lighttight slideable engagement with each other, means for removably attaching said film gate pieces to said carrier means, toggle means for causing the movement of one gate piece to partake or the linear movement of the other in an opposite direction and means for adjusting said carrier means by a rack and pinion connected therewith.

4. A film gate having meanscomprising interchangeable substantialiy L-shaped pieces for permitting the exposure of difierent lengths of film; and means for detachably mounting said pieces and for permitting relative motion thereof, whereby varyin lengths of a plurality of widths oifilmmaybemaskedbysaidgate.

- RUPERT H. DRAIGIR. 

